<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

<div id="app">

    <ul>
        <li v-for="(v,k,i) in student">{{i+1}}--{{k}}--{{v}}</li>
    </ul>

</div>
</body>

<script src="https://cdn.bootcss.com/vue/2.6.10/vue.js"></script>
<script>

    new Vue({
        el:'#app',
        data:{
            student:{
                username:'小鱼',
                age:20,
                girl:'如花'
            }
        }
    });

</script>